Now I'm learning. Again researched about this and found that this is indeed very common from here. I should also be doing some proper stretching to prepare my body for higher intensity jogging.
At this age I haven't experienced any back problem earlier in my sports activities I guess I don't need advice from doctors yet perhaps I need to follow this to correct my body curve and stay in shape while sitting, walking and jogging. I know of course a flabby stomach stops me from keeping a good curve or posture. Thinking in opposite direction problem with back must be due to something at the front.
Reading from here I thinking I'm just getting minor muscular pain so my plan for now would be
- Alternate between jog and brisking walking, I'll miss the fresh air if I don't get out of the bed in the morning
- do situps before going to bed
- stretching before walk/jog in the morning